In desperate need of help!
solve by factoring.
1. x^2=-25+10x
2. 2x^2+9x=5
3. The length of a square is 4x-3. Find the area in terms of x.
to use factoring, get everything on one side of the equation.
x^2 = -25 + 10x
x^2 - 10x + 25 = 0
The only factors of 15 are 1,5,25
(x-5)(x-5) is what you want
2x^2 + 9x = 5
2x^2 + 9x - 5 = 0
you know that you will have
(2x+?(x-?) or (2x-?)(x+?)
since 9 = 10-1, I'd look at
(2x-1)(x+5)
#3. come on, you know the area of a square is the side squared.